mail.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: GridView.count(
        padding: EdgeInsets.all(4),
        crossAxisSpacing: 4,
        mainAxisSpacing: 4,
        crossAxisCount: 3,
        shrinkWrap: true,
        children: [
          for (var i = 1; i <= 35; i++)
            Container(
              alignment: Alignment.center,
              height: 1000,
              decoration: BoxDecoration(
                color: Colors.black,
                boxShadow: [
                  BoxShadow(color: Colors.white24, spreadRadius: .5),
                ],
              ),
              child: Text('post $i'),
            )
        ],
      ),
    );
  }
}